I follow usually see telegram groups that actually provide accurate information. i did a small stage before going in to check it out. I usually monitor it from The Airdrop Detective telegram group. Maybe the prize is small, but if it's proven to be paid, I don't think there's anything wrong with joining and participating. For others, more in-depth research is needed. 
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there are quite many airdrops that might have potential of generating good profits for just some measly task but most of them nowadays require capital like retroactive where you should try out their blockchain which of course require you to pay some gas fee frequently. .